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| Year | Gg CO2 equivalent |
|---|---|
| 1990 | 21,366.19 |
| 1991 | 20,096.63 |
| 1992 | 17,659.17 |
| 1993 | 15,236.12 |
| 1994 | 14,154.42 |
| 1995 | 14,645.86 |
| 1996 | 14,917.93 |
| 1997 | 16,451.70 |
| 1998 | 19,298.36 |
| 1999 | 21,106.78 |
| 2000 | 22,818.93 |
| 2001 | 23,186.69 |
| 2002 | 23,326.73 |
| 2003 | 22,861.60 |